I loooove that movie!
i kinda had a problem like that when i was little, i used to have a suspicion that i was the only "real" person, and that everyone else turned into goblins or devils when i left the room and that they were just acting when i was with them...i've always had trouble letting my imagination get away from me. i used to really freak myself out that way.i would like sneak up around corners and barge into rooms to take people by surprise and catch them in there goblin form, but i obviously never did so i came to the conclusion that they all had their own thoughts and feelings, dreams and fears which was almost harder to imagine for me.
in conclusion i was a creepy little kid.